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    Module version: 1.1.1
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  <li><a href="https://metacpan.org/pod/Digest::base" title="Digest::base" class="ellipsis">Digest::base</a></li>
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<nav class="toc">
  <div class="toc-header"><strong>Contents</strong></div>
<ul>
  <li><a href="./Digest::SHA2.html#NAME">NAME</a></li>
  <li><a href="./Digest::SHA2.html#DEPRECATED">DEPRECATED</a></li>
  <li><a href="./Digest::SHA2.html#ABSTRACT">ABSTRACT</a></li>
  <li><a href="./Digest::SHA2.html#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="./Digest::SHA2.html#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="./Digest::SHA2.html#METHODS">METHODS</a></li>
  <li><a href="./Digest::SHA2.html#EXAMPLE-1">EXAMPLE 1</a></li>
  <li><a href="./Digest::SHA2.html#EXAMPLE-2">EXAMPLE 2</a></li>
  <li><a href="./Digest::SHA2.html#MORE-EXAMPLES">MORE EXAMPLES</a></li>
  <li><a href="./Digest::SHA2.html#DIGEST-SPEED">DIGEST SPEED</a></li>
  <li><a href="./Digest::SHA2.html#ACKNOWLEDGEMENT">ACKNOWLEDGEMENT</a></li>
  <li><a href="./Digest::SHA2.html#COPYRIGHT-AND-LICENSE">COPYRIGHT AND LICENSE</a></li>
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<div class="pod anchors">
<h1 id="NAME">NAME</h1>

<p>Digest::SHA2 - A variable-length one-way hash function (deprecated in favor of <a href="https://metacpan.org/pod/Digest::SHA">Digest::SHA</a>)</p>

<h1 id="DEPRECATED">DEPRECATED</h1>

<p>This module has numerious known bugs, is not compatable with the <a href="https://metacpan.org/pod/Digest">Digest</a> interface and its functionality is a subset of the functionality of <a href="https://metacpan.org/pod/Digest::SHA">Digest::SHA</a> (which is in perl core as of 5.9.3).</p>

<p>Please use <a href="https://metacpan.org/pod/Digest::SHA">Digest::SHA</a> instead of this module in new and old code.</p>

<h1 id="ABSTRACT">ABSTRACT</h1>

<p>Digest::SHA2 - A Perl interface for SHA-256, SHA-384 and SHA-512, collectively known as SHA-2</p>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>SHA-2 is the collective name of one-way hash functions developed by the NIST. SHA-256, SHA-384, and SHA-512 pertain to hashes whose outputs are 256 bits, 384 bits and 512 bits, respectively.</p>

<p>This Perl implementation is meant to be a replacement for the older SHA256 by Rafael R. Sevilla. His module has a bug in the SHA-256 implementation.</p>

<p>This new implementation uses the C source of Aaron Gifford.</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>    use Digest::SHA2;

    $sha2obj = new Digest::SHA2 [$hashlength];
    $sha2obj-&gt;add(LIST);
    $sha2obj-&gt;addfile(*HANDLE);
    $sha2obj-&gt;reset();

    $sha_clone = $sha2obj-&gt;clone();
    $digest = $sha2obj-&gt;digest();
    $digest = $sha2obj-&gt;hexdigest();
    $digest = $sha2obj-&gt;b64digest();
    $digest = $sha2obj-&gt;base64digest();  # deprecated

    $digest = $sha2obj-&gt;hashsize();
    $digest = $sha2obj-&gt;rounds();</code></pre>

<h1 id="METHODS">METHODS</h1>

<p>SHA-2 supports the following functions:</p>

<dl>

<dt id="new-[$hashlength]"><a id="new"></a><a id="new--hashlength"></a><b>new [$hashlength]</b></dt>
<dd>

<p>Creates a SHA-2 object, where <b>$hashlength</b> represents the hash output length; valid values for <b>$hashlength</b> are 256, 384, and 512 only. If <b>$hashlength</b> is omitted, the output defaults to 256 bits.</p>

<p>For example, to specify SHA-512, use</p>

<pre><code>        $sha2obj = new Digest::SHA2 512;</code></pre>

<p>To specify SHA-256, use</p>

<pre><code>        $sha2obj = new Digest::SHA2 256;</code></pre>

<p>or just simply</p>

<pre><code>        $sha2obj = new Digest::SHA2;</code></pre>

</dd>
<dt id="hashsize()"><a id="hashsize"></a><b>hashsize()</b></dt>
<dd>

<p>Returns the digest size (in bits) of the hash output used; valid sizes are 256, 384, and 512 only.</p>

</dd>
<dt id="rounds()"><a id="rounds"></a><b>rounds()</b></dt>
<dd>

<p>Returns the number of rounds (1, in this case) used to generate the hash output; this is included only so that <b>Digest::SHA2</b> is consistent with other one-way hash functions that have variable number of rounds, like <b>Haval</b> and <b>Tiger</b>.</p>

<p>Haval can uses 3, 4, or 5 rounds, with 5 different output lengths: 128, 160, 192, 224, and 256 bits, thereby, having 15 variants. Tiger, on the other hand, outputs 192 bits of digest, using 3 rounds; but for added security, can also use 4 rounds.</p>

</dd>
<dt id="add(LIST)"><a id="add"></a><a id="add-LIST"></a><b>add(LIST)</b></dt>
<dd>

<p>Hashes a string or a list of strings</p>

<p>For example,</p>

<pre><code>        $sha2obj-&gt;add($string1);
        $sha2obj-&gt;add($string2, $string3, $string4);</code></pre>

</dd>
<dt id="addfile(*HANDLE)"><a id="addfile"></a><a id="addfile-HANDLE"></a><b>addfile(*HANDLE)</b></dt>
<dd>

<p>Hashes a file whose file handle is <b>HANDLE</b></p>

</dd>
<dt id="reset()"><a id="reset"></a><b>reset()</b></dt>
<dd>

<p>Re-initializes the hash state of the SHA-2 object. Before calculating another digest, <b>reset()</b> refreshes the hash state, and is, therefore, functionally equivalent to the <b>new()</b> method, except that no SHA-2 object is created.</p>

</dd>
<dt id="digest()"><a id="digest"></a><b>digest()</b></dt>
<dd>

<p>Generates the hash output as a binary string</p>

</dd>
<dt id="hexdigest()"><a id="hexdigest"></a><b>hexdigest()</b></dt>
<dd>

<p>Generates a hexadecimal representation of the hash output</p>

</dd>
<dt id="base64digest()-(deprecated)"><a id="base64digest"></a><a id="base64digest---deprecated"></a><b>base64digest() (deprecated)</b></dt>
<dd>

<p>This will be removed in future releases; use <b>b64digest()</b> instead.</p>

</dd>
<dt id="b64digest()"><a id="b64digest"></a><b>b64digest()</b></dt>
<dd>

<p>Generates a base64 representation of the hash output</p>

</dd>
<dt id="clone()"><a id="clone"></a><b>clone()</b></dt>
<dd>

<p>Returns a copy of the SHA-2 object; useful when you want to preserve an intermediate value of the digest</p>

<p>For example,</p>

<pre><code>        my $clone = $sha2obj-&gt;clone();   # clone SHA-2 object

        my $sig = $sha2obj-&gt;clone-&gt;hexdigest;
        print &quot;partial digest: $sig\n&quot;;</code></pre>

</dd>
</dl>

<h1 id="EXAMPLE-1"><a id="EXAMPLE"></a>EXAMPLE 1</h1>

<pre><code>    #!/usr/local/bin/perl

    use diagnostics;
    use strict;
    use warnings;
    use Digest::SHA2;

    my $string1 = &quot;This is a string.&quot;;
    my $string2 = &quot;This is another string.&quot;;
    my $string3 = &quot;This is a string.This is another string.&quot;;

    my $sha2obj = new Digest::SHA2 512;
    print &quot;hash size = &quot;, $sha2obj-&gt;hashsize, &quot; bits\n&quot;;

    $sha2obj-&gt;add($string1);
    my $digest = $sha2obj-&gt;hexdigest();
    print &quot;Hash string1 only\n&quot;;
    print &quot;$digest\n\n&quot;;

    $sha2obj-&gt;reset();
    $sha2obj-&gt;add($string1, $string2);
    my $digest2 = $sha2obj-&gt;hexdigest();
    print &quot;Hash string1 and then hash string2\n&quot;;
    print &quot;$digest2\n\n&quot;;

    $sha2obj-&gt;reset();
    $sha2obj-&gt;add($string1);
    $sha2obj-&gt;add($string2);
    my $digest3 = $sha2obj-&gt;hexdigest();
    print &quot;Hash string1 and then hash string2\n&quot;;
    print &quot;$digest3\n\n&quot;;

    $sha2obj-&gt;reset();
    $sha2obj-&gt;add($string3);
    print &quot;Hash the two concatenated strings\n&quot;;
    my $digest4 = $sha2obj-&gt;hexdigest();
    print &quot;$digest4\n&quot;;</code></pre>

<h1 id="EXAMPLE-2"><a id="EXAMPLE1"></a>EXAMPLE 2</h1>

<pre><code>    #!/usr/local/bin/perl

    use diagnostics;
    use strict;
    use warnings;
    use MIME::Base64;
    use Digest::SHA2;

    my $file = &quot;strings&quot;;
    open INFILE, $file or die &quot;$file not found&quot;;

    my $sha2obj = new Digest::SHA2;  # defaults to 256-bit output
    $sha2obj-&gt;addfile(*INFILE);
    my $hex_output = $sha2obj-&gt;hexdigest();
    my $base64_output = $sha2obj-&gt;b64digest();
    close INFILE;
    print &quot;$file\n&quot;;
    print &quot;$hex_output\n&quot;;
    print &quot;$base64_output\n&quot;;</code></pre>

<h1 id="MORE-EXAMPLES"><a id="MORE"></a>MORE EXAMPLES</h1>

<p>See the &quot;examples&quot; and &quot;t&quot; directories for more examples.</p>

<h1 id="DIGEST-SPEED"><a id="DIGEST"></a>DIGEST SPEED</h1>

<p>Please consult the file, COMPARISON, for comparison of various one-way hash functions with digest lengths of 256, 384, and 512 bits.</p>

<h1 id="ACKNOWLEDGEMENT">ACKNOWLEDGEMENT</h1>

<p>I used the C source of Aaron Gifford as backend for this Perl implementation.</p>

<h1 id="COPYRIGHT-AND-LICENSE"><a id="COPYRIGHT"></a>COPYRIGHT AND LICENSE</h1>

<p>Copyright (C) 2003 Julius C. Duque. Please read contact.html that comes with this distribution for details on how to contact the author.</p>

<p>This library is free software; you can redistribute it and/or modify it under the same terms as the GNU General Public License.</p></div>

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